chore(deps): update dependency typescript to v3

Author: renovate-bot

package.json

@@ -15,7 +15,7 @@
     "@types/node": "9.4.6",
     "graphql": "14.0.2",
     "ts-node": "5.0.0",
-    "typescript": "2.7.2"
+    "typescript": "3.1.3"
   },
   "scripts": {
     "test": "cd src/example && ts-node test.ts",

yarn.lock

@@ -399,9 +399,9 @@ ts-node@5.0.0:
     source-map-support "^0.5.3"
     yn "^2.0.0"
 
-typescript@2.7.2:
-  version "2.7.2"
-  resolved "http://registry.npmjs.org/typescript/-/typescript-2.7.2.tgz#2d615a1ef4aee4f574425cdff7026edf81919836"
+typescript@3.1.3:
+  version "3.1.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.3.tgz#01b70247a6d3c2467f70c45795ef5ea18ce191d5"
 
 universalify@^0.1.0:
   version "0.1.2"